Originally Posted by mkoesel
Probably because it is standard practice to field-test all parts. Consider that a poor fitting, wear-prone, or noisy part might only be exposed in a real world test.
Also, I suspect that they will replace the N54 in the 35i with the N55. So that will need to be tested (although the car in the picture appears to be a four cylinder N20 model). It remains to be seen what will become of the 35is model.
+1 They probably did some suspension tweaks too as they have gotten a lot of flak for it being too soft.
Personally though I think it looks better with the yellow halos. I think it makes it look more aggressive.